{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<div class=\"contentcontainer med left\" style=\"margin-left: -50px;\">\n",
    "<dl class=\"dl-horizontal\">\n",
    "  <dt>Title</dt> <dd> Box Element</dd>\n",
    "  <dt>Dependencies</dt> <dd>Matplotlib</dd>\n",
    "  <dt>Backends</dt> <dd><a href='./Box.ipynb'>Matplotlib</a></dd> <dd><a href='../bokeh/Box.ipynb'>Bokeh</a></dd>\n",
    "</dl>\n",
    "</div>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import holoviews as hv\n",
    "from holoviews import opts\n",
    "\n",
    "hv.extension('matplotlib')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "A ``Box`` is an annotation that takes a center x-position, a center y-position and a size:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "data = np.sin(np.mgrid[0:100,0:100][1]/10.0)\n",
    "data[np.arange(40, 60), np.arange(20, 40)] = -1\n",
    "data[np.arange(40, 50), np.arange(70, 80)] = -3    \n",
    "(hv.Image(data) * hv.Box(-0.2, 0, 0.25 ) * hv.Box(-0, 0, (0.4,0.9))).opts(\n",
    "    opts.Box(color='red', linewidth=5),\n",
    "    opts.Image(cmap='gray'))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "In addition to these arguments, it supports an optional ``aspect ratio``:\n",
    "\n",
    "By default, the size argument results in a square such as the small square shown above. Alternatively, the size can be given as the tuple ``(width, height)`` resulting in a rectangle. If you only supply a size value, you can still specify a rectangle by specifying an optional aspect value. In addition, you can also set the orientation (in radians, rotating anticlockwise):"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "data = np.sin(np.mgrid[0:100,0:100][1]/10.0)\n",
    "data[np.arange(30, 70), np.arange(30, 70)] = -3\n",
    "box = hv.Box(-0, 0, 0.25, aspect=3, orientation=-np.pi/4)\n",
    "\n",
    "(hv.Image(data) * box).opts(\n",
    "    opts.Box(color='purple', linewidth=5),\n",
    "    opts.Image(cmap='gray'))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "For full documentation and the available style and plot options, use ``hv.help(hv.Box).``"
   ]
  }
 ],
 "metadata": {
  "language_info": {
   "name": "python",
   "pygments_lexer": "ipython3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}
